A serial-killer whose name is known all over the world. In 日本, it is often designated as "Jack the Ripper" without change. In spite of the frantic investigations of the Scotland Yard, it butchered five women and then disappeared without ever getting caught.

Because the true identity of Jack the Ripper has never been made clear, its shape changes in accordance with which Class it is summoned into. In this case, having manifested as an Assassin, it is an aggregation of children who were not allowed to be born.

Because this Assassin-Jack was killed before even being born, her wish for the Holy Grail is a regression to the womb--to return to her mother's womb. Although ignorant of the ways of the world, maybe due being summoned as Jack the Ripper, she is frighteningly quick-witted.

Maria the Ripper - Holy Mother of Dismemberment
A Noble Phantasm that reproduces the murders of Jack the Ripper. There are three necessary conditions: "the time period must be night", "the opponent must be 女" and "mist must occur".

She, who was summoned as Assassin, calls herself "Jack the Ripper"; but even her doesn't know if she is really the "true culprit". Although she has memories of killing several women, it is also unknown if they were Jack's victims.

As a child that was never loved, she was strongly seeking out for love. Regardless of whatever the Master is male or 女, she will probably demand his/her love as a "mother". While there is no problem in responding to that love, she might intend to sneak into your abdomen.